Abstract
The combined hyperfine interaction of mercury in a hexagonal close-packed cobalt single crystal was measured using the e−−γ perturbed angular correlation technique with the 197Hg and 199Hg probes, without applied magnetic field. The magnetic and quadrupole coupling constants of the 5/2− levels in both 197Hg and 199Hg were measured with extremely high precision, ωL( 197Hg)=951(9) Mrad/s, ωL (199Hg)=1039(10) Mrad/s, vQ (197Hg)=3.7(5) MHz and vQ (199Hg)=32(2) MHz. Using the well-known g factors and quadrupole moments of the respective levels, the magnetic hyperfine field, ‖Hhf(HgCo)‖=581(12) kG, and the electric field gradient, ‖Vzz(HgCo)‖ =2.0(3)×1017 V/cm2, were derived. The importance of using these hyperfine probes for studying the microscopic structure of cobalt-based multilayers is introduced and discussed.
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